A fork of Rural Dictionary
Permanent grin. Usually a result of great fortune arriving in someone's life; a brand new love, winning the lottery (or one of my personal fav's: watching someone illegally passing on the shoulder during rush hour and promptly getting NAILED by the cops.)
source: Rebecca L. of Montana
Look at the perm-a-grin on his face. He is totally twitterpated with her. He smiles all the time, can't stop talking about her, he is always texting or calling her. That boy is whipped!